Remove unnecessary UUID counter check #170

sixcolors · 2025-12-09T06:30:31Z

This pull request removes an unnecessary counter check in the UUID generation code that could cause a panic under certain conditions. The check was redundant and has been eliminated to prevent potential runtime errors.

Summary by CodeRabbit

Bug Fixes
- UUID generation is more robust: errors that previously caused abrupt termination are now surfaced as recoverable errors, and an overly strict post-seed validation has been removed so UUID creation proceeds reliably in edge cases.

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gemini-code-assist · 2025-12-09T06:30:40Z

Summary of Changes

Hello @sixcolors, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on enhancing the robustness of the UUID generation mechanism by eliminating a superfluous counter check. This check was identified as redundant and a potential source of runtime panics, and its removal ensures a more stable and reliable UUID generation process without impacting the uniqueness or integrity of the identifiers.

Highlights

UUID Generation: Removed a redundant counter check in the UUID generation logic that could lead to a panic under certain conditions, improving stability.

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Code Review

This pull request correctly removes a check in the UUID function that could lead to a panic. The condition if atomic.LoadUint64(&uuidCounter) <= 0 would trigger a panic if the uuidCounter wrapped around to zero after 2^64 increments, a scenario that could occur in long-running applications. While the check may have been intended to prevent issues from a zero-value initial seed, panicking is a harsh response to such an astronomically rare event. Removing this check makes the function more robust. The change is a clear improvement and is approved.

codecov · 2025-12-09T06:31:36Z

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.98%. Comparing base (99f0c38) to head (4349ea2).
⚠️ Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
common.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #170      +/-   ##
==========================================
+ Coverage   84.81%   84.98%   +0.17%     
==========================================
  Files          12       12              
  Lines         968      966       -2     
==========================================
  Hits          821      821              
+ Misses        126      125       -1     
+ Partials       21       20       -1

Flag	Coverage Δ
unittests	`84.98% <0.00%> (+0.17%)`	⬆️

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Copilot

Pull request overview

This pull request removes a logically flawed check in the UUID generation code that could have caused false-positive panics. The check attempted to verify if the UUID counter was properly initialized but was fundamentally incorrect because it tested if an unsigned integer (uint64) was less than or equal to zero, which would only trigger if the counter happened to be initialized to zero—a valid random value.

Key Changes:

Removed the redundant and incorrect atomic.LoadUint64(&uuidCounter) <= 0 check that followed the uuidSetup.Do() initialization

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coderabbitai · 2025-12-09T06:32:28Z

Walkthrough

Replaced use of fmt.Sprintf inside panics with fmt.Errorf wrapping for UUID seed and UUIDv4 failures, and removed a post-seed sanity panic that enforced uuidCounter > 0, allowing UUID generation to proceed without that runtime check.

Changes

Cohort / File(s)	Summary
UUID panic wrapping & sanity-check removal `common.go`	Replaced `panic(fmt.Sprintf(...))` calls with `panic(fmt.Errorf(...))` in UUID seeding and UUIDv4 failure paths. Removed the post-seed atomic check that panicked when `uuidCounter <= 0`, eliminating that runtime sanity panic.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Areas to inspect closely:
- Confirm panic wrapping with fmt.Errorf preserves the intended message and stack/context.
- Review whether any initialization or race assumptions relied on the removed uuidCounter > 0 panic.

Poem

🐰 I hummed a softer error tune,
Wrapped the cry beneath the moon,
Counters skip the stern alarm,
Seeds take root without the harm,
Hopping onward, calm and soon. ✨

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The PR title accurately reflects the main change: removing the post-seed UUID counter sanity check that was causing unnecessary panics.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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Create PR with unit tests
Post copyable unit tests in a comment
Commit unit tests in branch feat/uuid-panic-fix

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Reviewing files that changed from the base of the PR and between d3e76ce and 4349ea2.

📒 Files selected for processing (1)

common.go (2 hunks)

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (3)

GitHub Check: Build (1.24.x, windows-latest)
GitHub Check: Compare
GitHub Check: Build (1.23.x, macos-latest)

🔇 Additional comments (2)

common.go (2)

55-67: UUID seeding panic + removed counter sanity check look good

Using fmt.Errorf("utils: failed to seed UUID generator: %w", err) fixes the prior lint warning and preserves the original error, and dropping the uuidCounter > 0 sanity panic avoids an extremely rare, random-seed–dependent panic while keeping the counter logic correct (atomic.AddUint64 works fine even if the initial seed happens to be 0).

If you want to double‑check tooling status, please rerun your usual golangci-lint pipeline on this branch to confirm all errorlint warnings are resolved.

92-95: UUIDv4 error wrapping change is correct and consistent

Wrapping the uuid.NewRandom() error with fmt.Errorf("...: %w", err) before panicking is consistent with the seeding path, preserves the error chain for any recover-based handling, and should satisfy the linter’s error-wrapping rule.

Consider rerunning your lint job to verify that the previous fmt.Errorf %v diagnostics are cleared.

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coderabbitai

Actionable comments posted: 2

📜 Review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 70d3684 and d3e76ce.

📒 Files selected for processing (1)

common.go (2 hunks)

🧰 Additional context used

🪛 GitHub Actions: golangci-lint

common.go

[error] 60-60: golangci-lint: non-wrapping format verb for fmt.Errorf. Use %w to format errors (errorlint).

🪛 GitHub Check: lint

common.go

[failure] 60-60:
non-wrapping format verb for fmt.Errorf. Use %w to format errors (errorlint)

[failure] 94-94:
non-wrapping format verb for fmt.Errorf. Use %w to format errors (errorlint)

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (2)

GitHub Check: Build (1.23.x, macos-13)
GitHub Check: Compare

🔇 Additional comments (1)

common.go (1)

56-87: Removal of the counter check looks correct.

The atomic increment on line 65 ensures uuidCounter is always non-zero before use (since it's incremented before the value is consumed). The removed panic was indeed redundant—even in the astronomically unlikely case where all 8 seed bytes are zero, the UUID generation would still function correctly after the increment.

common.go

Remove unnecessary UUID counter check that could panic

70d3684

Copilot AI review requested due to automatic review settings December 9, 2025 06:30

sixcolors requested a review from a team as a code owner December 9, 2025 06:30

sixcolors requested review from ReneWerner87, efectn and gaby and removed request for a team December 9, 2025 06:30

ReneWerner87 added the 🧹 Updates label Dec 9, 2025

Copilot started reviewing on behalf of sixcolors December 9, 2025 06:30 View session

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Copilot AI reviewed Dec 9, 2025

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sixcolors added 2 commits December 9, 2025 15:17

fix: improve error handling in UUID seeding to use fmt.Errorf

39bfd2a

fix: improve panic message formatting in UUIDv4 function

d3e76ce

coderabbitai bot reviewed Dec 9, 2025

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common.go Show resolved Hide resolved

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fix: improve error wrapping in UUID generator seeding

4349ea2

ReneWerner87 approved these changes Dec 12, 2025

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ReneWerner87 merged commit e0d3c4a into master Dec 12, 2025
23 of 29 checks passed

ReneWerner87 deleted the feat/uuid-panic-fix branch December 12, 2025 10:46

coderabbitai bot mentioned this pull request Dec 12, 2025

Remove UUID() function due to insufficient randomness for security #175

Merged

sixcolors mentioned this pull request Dec 12, 2025

feat: migrate from UUIDv4 to SecureToken for key generation gofiber/fiber#3946

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Remove unnecessary UUID counter check #170

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sixcolors commented Dec 9, 2025 •

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